Portable tree step



FIG. 1 is a perspective view of a portable tree step showing our new design;

FIG. 2 is an opposite side perspective view thereof;

FIG. 3 is an enlarged top plan view thereof;

FIG. 4 is an enlarged side elevational view thereof with the opposite side being a mirror image thereof;

FIG. 5 is an enlarged bottom plan view thereof;

FIG. 6 is an enlarged front elevational view thereof; and,

FIG. 7 is an enlarged rear elevational view thereof.

The broken line showing of a hook member if FIGS. 1 and 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portable tree step, as shown and described. 